We have two. One at nav station one in cockpit. Cockpit only ever gets turned on when outside harbour. If I cannot sail around Sydney Harbour without a bloody plotter then its time for me to give it away.

On passage we'll have both running at night, cockpit only during the day.

If anchored in an uncomfortable spot then we'll leave one running overnight for anchor alarm.

Andrew B (Malö 39 Classic)

“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett.